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Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine

A technology for sand-coated iron mold casting and gray cast iron, which is applied in the directions of molds, mold components, and manufacturing tools. Improved strength and working environment, good surface quality, good dimensional consistency

Active Publication Date: 2012-10-17
JIANGSU SONGLIN AUTOMOBILE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rigidity of the casting mold made by the above casting process is poor, so the surface quality of the casting is poor, the dimensional accuracy is poor, the machining allowance of the blank is large, the wall thickness is uneven, the material is unstable, the water leakage rate is high, and the process operability is poor, the working environment of the workers is poor, and the occupation big venue

Method used

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  • Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine
  • Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine
  • Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0045] figure 1 Shown is a schematic cross-sectional structure diagram of a gray iron flywheel housing casting 1 for a diesel engine.

[0046] figure 2 As shown, a schematic diagram of the upper iron mold sand-coated structure of the iron mold sand-coated casting process of the gray iron flywheel housing of a diesel engine, including the upper iron mold 2, the runner mold 7 and the upper mold 3, the surface structure of the upper mold and the flywheel housing casting The upper surface structure is the same, and there is a sand-covered cavity between the upper iron mold and the upper mold. There are multiple sand-covering holes 4 connected to the sand-coating cavity on the top. Through the multiple sand-shot holes on the upper iron mold, the sand-coating cavity between the upper iron mold and the upper mold is filled with coated sand by compressed air to form a sand-coated mold. Layer 5, pierce an air hole 6 into the sand-covered layer from each sand shooting hole.

[0047]...

Embodiment 1

[0049] Embodiment one; Casting process of the present invention comprises steps as follows:

[0050] (1) Manufacture of iron molds and molds: Make upper and lower molds according to the size of flywheel shell castings, and make upper and lower iron molds corresponding to the size of upper and lower molds with sand-covered cavities, and set casting system and multiple molds on the upper iron molds Sand shooting holes, set multiple sand shooting holes on the lower iron mold;

[0051] (2) Upper and lower casting shapes:

[0052] (2a) Preheat the upper iron mold and the upper mold, and the lower iron mold and the lower mold on the sand coating machine respectively. The iron mold preheating temperature is 240°C, and the mold preheating temperature is 240°C; Mold, spray release agent on the outer walls of the upper and lower molds, and then fit;

[0053] (2b) Fill the sand-covered cavity between the upper iron mold and the upper mold, the lower iron mold and the lower mold with co...

Embodiment 2

[0072] Embodiment two; Casting process of the present invention comprises steps as follows:

[0073] (1) Manufacture of iron molds and molds: Make upper and lower molds according to the size of flywheel shell castings, and make upper and lower iron molds corresponding to the size of upper and lower molds with sand-covered cavities, and set casting system and multiple molds on the upper iron molds Sand shooting holes, set multiple sand shooting holes on the lower iron mold;

[0074] (2) Upper and lower casting shapes:

[0075] (2a) Preheat the upper iron mold and the upper mold, and the lower iron mold and the lower mold on the sand coating machine respectively. The iron mold preheating temperature is 260°C, and the mold preheating temperature is 260°C; Mold, spray release agent on the outer walls of the upper and lower molds, and then fit;

[0076] (2b) Fill the sand-covered cavity between the upper iron mold and the upper mold, the lower iron mold and the lower mold with co...

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Abstract

The invention discloses a sand-line iron mould casting process for grey cast iron flywheel housings of diesel engines. In the invention, upper and lower sand-line iron mould processes are used, so that produced grey cast iron flywheel housing blanks have favorable geometric size precision which can be up to CT8 grade, favorable surface roughness which can be up to 12.5 microns and favorable mechanical properties, the blank processing has small allowance which can be controlled in 3mm, small flashing distortion which can be controlled in 0.5mm and small cleaning workload, so that the labor environment is improved, the environmental protection is improved, the yield is high and can be up to 95%, and the national policies of energy conservation, environmental protection and sustainable development are met.

Description

technical field [0001] The invention relates to a casting process, in particular to a sand-covered casting process for an iron mold of a gray cast iron flywheel shell of a diesel engine. The casting has good geometric dimension accuracy and surface quality, a small blank machining allowance and good mechanical properties. Background technique [0002] The flywheel housing is one of the main parts of the diesel engine, especially the diesel engine that the flywheel housing involved in the present invention is a high-power high-end diesel engine recently imported from abroad, with heavy load, complex shape and high dimensional accuracy. It is a product that combines the flywheel housing and the gear chamber cover. After the gear chamber is machined, a hydraulic test must be done. The pressure is 0.6MPa, and there must be no water leakage for 5 minutes. The quality requirements are relatively high. [0003] The traditional casting process of gray iron flywheel housing mainly ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/24B22C9/08B22C7/06B22D1/00
Inventor 周国平徐新元陈进
Owner JIANGSU SONGLIN AUTOMOBILE PARTS
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